Multi-Wavelength Optical Imaging for Focus-Free Oblique Inspection
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Solution Overview
Problem
Conventional contactless imaging methods using cameras often result in out-of-focus areas when imaging objects obliquely, leading to incomplete capture of the object's information.
Innovation Solution
An optical apparatus and system that utilizes two distinct wavelengths of light to illuminate and receive light from different points on a moving object, allowing for simultaneous imaging of these points without the need for focusing, enabling oblique imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional camera imaging is used for oblique imaging, then the imaging structure is simple, but out-of-focus areas appear and imaging completeness deteriorates
Solution Approach 1:
The imaging system is segmented into multiple independent measurement points (first measurement point and second measurement point) that can simultaneously capture different wavelength information. Each measurement point operates independently with its own illumination and detection elements, allowing oblique imaging without focus limitations while maintaining manageable system complexity through modular design
Solution Approach 2:
The patent introduces a wavelength dimension to the imaging process by simultaneously measuring multiple wavelengths (first wavelength and second wavelength) at different spatial points. This additional dimensional parameter enables the system to distinguish between oblique and facing positions, resolving the focus issue without requiring complex mechanical focusing mechanisms
2Loss of information
If single wavelength illumination is used, then the imaging system is simple, but wavelength-specific information is lost
Solution Approach 1:
The illumination system is segmented into separate first illumination and second illumination units, each dedicated to a specific wavelength. This segmentation allows independent control and optimization of each wavelength's illumination characteristics while preserving wavelength-specific information. The corresponding detection points are similarly segmented to receive and measure each wavelength separately
Solution Approach 2:
Different regions of the imaging system are assigned different functional qualities: the first measurement point is optimized for receiving first wavelength light, while the second measurement point is optimized for second wavelength light. This local quality differentiation ensures that each measurement point captures wavelength-specific information effectively, preventing information loss while maintaining clear functional differentiation in the system
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables focus-free imaging of moving objects from both facing and oblique positions, improving the capture of reflectance and transmittance distributions by distinguishing between different wavelengths of light.
Implementation Method 1
The first light receiving element is configured to distinctively and independently receive the first wavelength and the second wavelength
Data Source
AI summary
According to an embodiment, an optical apparatus includes: an illumination portion, a light receiving portion, and a processor. The illumination portion is configured to illuminate an object with light. The illumination portion is configured to illuminate a first illumination point of the object with light having a first wavelength and illuminate a second illumination point different from the first illumination point of the object with light having a second wavelength. The light receiving portion is configured to move relative to the object while maintaining a positional relationship with the illumination portion and is configured to receive light that passed through the first illumination point of the object and light that passed through the second illumination point. The processor is configured to image the object by light reception signals of the light that passed through the first illumination point and the second illumination point.